package net.dreamlu.common.utils;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class StringUtils extends org.apache.commons.lang3.StringUtils {

	/**
	 * 下划线转驼峰法(默认小驼峰)
	 *
	 * @param line 源字符串
	 * @param smallCamel 大小驼峰,是否为小驼峰(驼峰，第一个字符是大写还是小写)
	 * @return 转换后的字符串
	 */
	public static String underline2Camel(String line, boolean... smallCamel) {
		if (line == null || "".equals(line)) {
			return "";
		}
		StringBuffer sb = new StringBuffer();
		Pattern pattern = Pattern.compile("([A-Za-z\\d]+)(_)?");
		Matcher matcher = pattern.matcher(line);
		// 匹配正则表达式
		while (matcher.find()) {
			String word = matcher.group();
			// 当是true 或则是空的情况
			if ((smallCamel.length == 0 || smallCamel[0]) && matcher.start() == 0) {
				sb.append(Character.toLowerCase(word.charAt(0)));
			} else {
				sb.append(Character.toUpperCase(word.charAt(0)));
			}

			int index = word.lastIndexOf('_');
			if (index > 0) {
				sb.append(word.substring(1, index).toLowerCase());
			} else {
				sb.append(word.substring(1).toLowerCase());
			}
		}
		return sb.toString();
	}

	/**
	 * 驼峰法转下划线
	 *
	 * @param line 源字符串
	 * @return 转换后的字符串
	 */
	public static String camel2Underline(String line) {
		if (line == null || "".equals(line)) {
			return "";
		}
		if (!StringUtils.contains(line, "_")) {
			return line;
		}
		line = String.valueOf(line.charAt(0)).toUpperCase().concat(line.substring(1));
		StringBuffer sb = new StringBuffer();
		Pattern pattern = Pattern.compile("[A-Z]([a-z\\d]+)?");
		Matcher matcher = pattern.matcher(line);
		while (matcher.find()) {
			String word = matcher.group();
			sb.append(word.toUpperCase());
			sb.append(matcher.end() == line.length() ? "" : "_");
		}
		return sb.toString();
	}

//	public static void main(String[] args) {
//		String line = "are_you_dou_bi_yellowcong";
//		// 下划线转驼峰（大驼峰）
//		// AreYouDouBiYellowcong
//		String camel = underline2Camel(line, false);
//		System.out.println(camel);
//
//		// 下划线转驼峰（小驼峰）
//		// areYouDouBiYellowcong
//		camel = underline2Camel("createTime");
//		System.out.println(camel);
//
//		// 驼峰转下划线
//		// ARE_YOU_DOU_BI_YELLOWCONG
//		System.out.println(camel2Underline(camel));
//	}
}